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Dynamic Alignment of Artificial Legs with the Adjustable Coupling

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Dynamic Alignment of Artificial Legs with the Adjustable Coupling Dynamic Alignment of Artificial Legs with the Adjustable Coupling ANTHONY STAROS, M.S.M.E.1 SINCE World War II one of the most signifi­ what different type of function, is a question­ cant advances in limb prosthetics has been able procedure; i.e., alignment suitable for a the introduction of rational principles for constant friction unit may not make proper fitting and aligning artificial legs (2,11). The use of the functions provided by more sophisti­ University of California (Berkeley—San Fran­ cated devices. Some prosthetists have learned cisco), sponsored by the Veterans Administra­ to accommodate for the required deviations by tion, has been primarily responsible for the rules of thumb, but essential are some method steady improvement in methods and devices and some tool for dynamic alignment to be used by prosthetists in artificial-leg construc­ made directly on the knee or knee-shank-foot tion. mechanism to be used in the final prosthesis. To assist the prosthetist in carrying out these Ideally, the device should be of simple design principles, a number of mechanical aids or tools and useful for both above-knee and below-knee were devised. The two adjustable legs—one cases. For the above-knee case, such a device for above-knee cases (Fig. 1), the other for should be inserted between the socket and cases below the knee (Fig. 2)—and an align­ permanent prosthetic knee for "functional" ment duplication jig (Fig. 3) were developed alignment. by the University of California, and are now If the unit were simple enough, it would recognized as important tools of the prosthetist be expected that more generalized use of (4). And dynamic alignment of artificial legs is alignment tools might result, and that facilities a standard part of the curriculum of prosthetics in other countries, where it is difficult to schools (1) and standard operating procedure procure adjustable legs, could enjoy the ad­ in most limbshops. vantages of dynamic alignment. Moreover, But there have been problems. For one, the the alignment-transfer process needed scrutiny limbshop must have a minimum of two ad­ to see if simplifications in the equipment justable legs for adult cases, and two smaller necessary might result. ones for child cases. A shop of any size requires For these reasons, the VA Prosthetics multiple quantities because frequently a given Center developed the Adjustable Coupling, unit must remain attached to a socket for a sometimes termed the "Staros-Gardner Cou­ particular amputee for an extended period of pling." time. And to make best use of the adjustable legs an alignment transfer jig is needed. DESCRIPTION OF THE ADJUSTABLE COUPLING Other limitations in the above-knee adjust­ able leg appeared when knee units or knee- The adjustable coupling (Fig. 4) consists shank-foot units with fairly complex functions essentially of two plate assemblies held to­ were introduced. Use of the UC adjustable gether by a central toggle pin. Mounted to a AK leg, with its single-axis, constant friction middle or intermediate plate but part of one joint for achieving alignment which is to be plate assembly are four screw subassemblies, transferred to a permanent leg having a some- spaced 90 deg. apart, which contain indepen­ 1 Chief, Veterans Administration Prosthetics Center, dently adjustable, knurled screws used to 252 Seventh Ave., New York 1, N. Y. "lock" the entire coupling as well as to provide 31 32 Fig 2. A below-knee adjustable leg used in current practice. and intermediate plates both contain "A" and "P" marks to indicate the anterior and pos­ terior sides, respectively. The two assemblies contain countersunk holes for screws used for attachment to the prosthesis. The top assembly, primarily offering medio- lateral and tilt adjustability, contains a 1-1/4 in., 1/8 in. increment scale for gauging medio- lateral adjustments (with an index on the Fig. 1. An above-knee adjustable leg. single-flange toggle which is free to slide with respect to the top plate). A tilt scale2 is pro­ adjustment for adduction-abduction and vided by markings on the threaded bushings flexion-extension. of the four tilt-screw subassemblies. The In Figure 5 are illustrated the major assem­ 2 blies of the coupling. The single-flange part of All scales have "neutral" positions highlighted. The "neutral" positions on the tilt scales are most important the toggle and the top plate constitute the in establishing the middle position of tilt, when top top assembly. The bottom assembly contains and bottom plates are parallel, or for disassembly, the "box" part of the toggle, the bottom plate, when it is important to "unlock" the coupling by the intermediate plate, the four tilt-screw having all four tilt screws down at least two incre­ subassemblies, and the toggle pin. The bottom ments below "neutral." 33 indexes for tilt scaling are the lower surfaces respect to the bottom plate. On the anterior of the knurled screws. Scale sensitivity for surface of the bottom plate is the 20-deg. tilt adjustment is 2 deg. (2-deg. increment) rotation scale. The index The bottom assembly provides rotation is located on the intermediate plate. The about the vertical axis and anteroposterior anteroposterior adjustment scale consists of adjustability because the intermediate plate a series of arcs, 1/8 in. apart for 1-3/4 in., etched (and toggle "box") is free to move with on the top surface of the bottom plate. The index for this scale is simply the outer contour of the intermediate plate. The coupling, made primarily from an aluminum alloy (except for the toggle assembly which is steel), weighs 12 oz., is 3-3/4 in. in diameter, and is 1-1/8 in. thick when the plates are parallel. Ranges of adjustment are as follows: 1. Mediolateral: Total Range—1-1/4 in. Increment of Scale Markings—1/8 in. 2. Anteroposterior: Total Range—1-3/4 in. Increment of Scale Markings—1/8 in. 3. Tilt: Total Range—10 deg. Increment of Scale Markings—2 deg. 4. Rotation: Total Range—20 deg. Increment of Scale Markings—2 deg. The coupling is disassembled by first lower­ ing each of the four tilt screws two increments on the tilt scale. This operation loosens the entire assembly because it is held together as a result of the forces produced by tightening the force screws, and the toggle pin can thus be disengaged from the toggle box and flange. The top assembly and bottom assembly can then be separated. Installation of the coupling into a prosthesis is made with the coupling so separated. Fig. 3. Alignment duplication jig. A, Adjustable leg mounted in jig. B, Adjustable leg has been removed and INSTALLATION OF THE COUPLING FOR DYNAMIC wooden set-up substituted. Prosthetist is sawing shank to proper length. ALIGNMENT {10) Figures 6 and 7 show the coupling in posi­ tion for dynamic-alignment trials. When installed, the coupling should be located as close as possible to the distal end of the stump. A piece of material may have to be added to accommodate the wood screws without affect­ ing the socket sealing plate itself. By so locat­ ing the coupling, small tilt adjustments on the coupling will produce major changes in the geometrical relationship of stump to prosthetic components distal to the coupling. When the "bench" or static alignment is reasonably close, the 10 deg. range of tilt adjustment is Fig. 4. The adjustable coupling assembled. more than adequate. 34 Fig. 5. Major assemblies and parts of the adjustable coupling. The toggle pin is permanently located in the semi circular channel just above the AA marks on the intermediate plate. From (10). After the socket is constructed and the com­ with respect to the socket. The coupling is ponents approximately dimensioned3 length­ then set with all adjustments on "neutral" so wise, the top assembly of the coupling is that top plate and bottom plate are parallel attached to the bottom of the socket using and coaxial, care being taken to ensure that as many wood screws as possible (Fig. 8). the intermediate plate is not rotated with The bottom assembly then is attached to the respect to the bottom plate. top assembly by placing the single-flange part The socket with the coupling attached is of the toggle within the "box" part and pushing then temporarily placed on the above-knee the toggle pin through the holes in both toggle setup (knee-shank-foot) or on the below-knee parts. One must make certain that the "A" setup (shank-foot). A height check4 is made marks (or "P" marks) are located properly with the amputee standing on the prosthesis. 3 The over-all length of socket, knee unit, shank 4 With especially long above-knee stumps, the piece, and foot, plus 1-1/8 in. for the coupling, should knee center must be dropped during alignment trials be slightly larger than the amputee's dimensional because of the thickness of the coupling. Later, during requirements. Later sanding after a height check will transfer, true or near-true knee-center height can be produce accurate longitudinal dimensioning. restored. 35 Fig. 6. The coupling installed in an above-knee prosthesis. Since the coupling has not been fully assem­ bled into the prosthesis, the prosthetist must, of course, assist the amputee in maintaining stability. After the height check has been made, the section of the prosthesis below the coupling (on the knee block or shank) can be sanded to obtain the correct height. One must consider the desired static or bench alignment before fully attaching the bottom plate assembly to the prosthesis. A Fig. 7. The coupling installed in a below-knee recently published chart (8) shows recom- prosthesis.
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